fix "alpha" kwarg in errorbar plot

- this patch was rightly proposed by Hans Dembinski on the matplotlib
  devel mailing list but never incorporated it seems
Fix SVG flip when svg.image_noscale is True
added QtGui.QMainWindow.closeEvent() to make sure the close event
cascades up properly.

issue #1676
PEP8 fix
Merge pull request #1674 from dmcdougall/fix_svg_flip

Fix SVG flip when svg.image_noscale is True
Merge remote-tracking branch 'upstream/v1.2.x'
Merge pull request #1678 from tacaswell/qt4_closeevent

added QtGui.QMainWindow.closeEvent() to make sure the close event
Fixed the expected output from test_arrow_patches.test_fancyarrow.

Regenerated from test output.
changing errorbar test to cover "alpha" kwarg
Merge pull request #1675 from megies/errorbar_alpha

fix "alpha" kwarg in errorbar plot
Fix overwriting suptitle
Add suptitle overwrite test
Update test_pickle baseline image
Merge pull request #1663 from dmcdougall/fix_suptitle

Fix suptitle
Merge pull request #1682 from mgiuca-google/fix-expected-test_arrow_patches

Fixed the expected output from test_arrow_patches.test_fancyarrow.
Merge branch 'v1.2.x'

Conflicts:
	lib/matplotlib/tests/baseline_images/test_axes/errorbar_mixed.pdf
	lib/matplotlib/tests/baseline_images/test_axes/errorbar_mixed.png
fixes Issue #1693

Explicitly trim rgbFace to length 3 so that the string formats do
not blow up.
Merge pull request #1694 from tacaswell/ps_backend_fix

fixes Issue #1693
Use antialiasing on the text for the tests.
test_axes: Remove more arbitrary large tolerances.